A kind of production process of recovering potassium chloride from saturated potassium mirabilite mother liquor

Abstract

The invention provides a production technology for recycling potassium chloride from saturated glaserite mother liquor. The production technology comprises the following steps of 1, conducting brine mixing, wherein the saturated glaserite mother liquor and old brine in a salt lake are mixed according to the mass ratio of 1:0.6-1.5, and mother liquor mixed with the brine is obtained; 2, sun-curing sylvine, wherein after 20 wt%-35 wt% of water in the mother liquor mixed with the brine is naturally evaporated, solid-liquor separation is conduced, and then the sylvine and mother liquor A are obtained; 3, sun-curing carnallite, wherein after 10 wt%-30 wt% of water in the mother liquor A is naturally evaporated, solid-liquor separation is conduced, and carnallite and mother liquor B are obtained; 4, extracting potassium chloride, wherein floatation is conducted on the sylvine and the carnallite, and then the potassium chloride product is obtained. By the adoption of the production technology, the recovery rate of K+ in a technological salt field reaches up to 96.61%, the total yield of the K+ of a system reaches up to 91.95%, the purity of the potassium chloride product reaches up to 98.06%, and the potassium chloride product meets the agricultural potassium chloride superior product standard. The production technology is simple, low in energy consumption and cost, avoids co-separation of potassium-containing sulfate minerals, part of old brine in the salt field can be digested, and the environmental-protection problem is effectively relieved.

Description

technical field [0001] The invention relates to a potassium salt recovery process, in particular to a production process for recovering potassium chloride from saturated potassium mirabilite mother liquor. Background technique [0002] Potassium chloride is the main raw material in the conversion of potassium sulfate production, widely exists in solid potassium salt ore, or can be extracted and separated from potassium-containing sea salt lakes. In the production of potassium sulfate by the conversion of Glauber's salt, a large amount of first-stage conversion mother liquor, that is, saturated potassium Glauber's salt mother liquor, whose potassium content is about 40% of the potassium content in the system, will be produced. If it is not properly recycled, it will greatly affect the system. Potassium yield, reducing the production efficiency of enterprises. It is difficult for the mother liquor to obtain relatively pure single potassium salt through a pure evaporation and ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, break through the technical shortcomings of the existing potassium salt recovery process complex and difficult separation, and provide a simple process, low energy consumption and cost, and less equipment investment. A production process for recovering potassium chloride from saturated potassium mirabilite mother liquor, which avoids eutectoid of potassium-containing sulfate minerals, improves crystal phase composition, and has a high recovery rate of potassium chloride

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